1942 Longbranch question

[Seaspriter]

It probably got worked on to fix a specific problem and didn't necessarily see a full blown FTR.

Armourers like me the world over just took the next part off the shelf, carefully fitted it, tested it and sent it on its way. We didn't give a fig whether the part was made in Canada, the USA or Cardiff. Others who live in another orbitory planet who are more experienced in the ways of the real world that Armourers live think we did search for all X or Y or Z made parts but I can assure you we didn't

Peter and Brian probably nailed it and will probably amplify or qualify what I'm venturing here. The FTR process was a full Factory Thorough Repair to bring the rifle up to full service standards. But there were field armourers behind the battle lines that would do a field repair* -- a quick fix, so to speak , often right on the spot, like a tune-up -- then send the soldier back to the lines. If it was a race car, we'd call it the "pit crew," with tool kits. Most battlefield rifles are made for field stripping, cleaning, and easy parts replacement.
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* Question: Does FR stamped on a stock mean "Field Repair?" One of my Savage Enfields has this stamp and it was obviously repaired with a replacement butt stock.